﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;

namespace WindowManagerService
{
    public class KeyboardService
    {
        private int handle;
        public KeyboardService(int handle)
        {
            this.handle = handle;
        }

        #region SendMessage Constants

        private const int WM_LBUTTONDOWN = 0x0201;
        private const int WM_LBUTTONUP = 0x0202;
        private const int WM_LBUTTONDBLCLK = 0x0203;
        private const int WM_RBUTTONDOWN = 0x0204;
        private const int WM_RBUTTONUP = 0x0205;
        private const int WM_RBUTTONDBLCLK = 0x0206;
        private const int WM_MOUSEMOVE = 0x0200;

        private const int WM_KEYDOWN = 0x100;
        private const int WM_KEYUP = 0x0101;
        private const int WM_CHAR = 0x0102;

        #endregion SendMessage Constants

        #region Virtual Keys Constants

        public const int VK_0 = 0x30;
        public const int VK_1 = 0x31;
        public const int VK_2 = 0x32;
        public const int VK_3 = 0x33;
        public const int VK_4 = 0x34;
        public const int VK_5 = 0x35;
        public const int VK_6 = 0x36;
        public const int VK_7 = 0x37;
        public const int VK_8 = 0x38;
        public const int VK_9 = 0x39;
        public const int VK_A = 0x41;
        public const int VK_B = 0x42;
        public const int VK_C = 0x43;
        public const int VK_D = 0x44;
        public const int VK_E = 0x45;
        public const int VK_F = 0x46;
        public const int VK_G = 0x47;
        public const int VK_H = 0x48;
        public const int VK_I = 0x49;
        public const int VK_J = 0x4A;
        public const int VK_K = 0x4B;
        public const int VK_L = 0x4C;
        public const int VK_M = 0x4D;
        public const int VK_N = 0x4E;
        public const int VK_O = 0x4F;
        public const int VK_P = 0x50;
        public const int VK_Q = 0x51;
        public const int VK_R = 0x52;
        public const int VK_S = 0x53;
        public const int VK_T = 0x54;
        public const int VK_U = 0x55;
        public const int VK_V = 0x56;
        public const int VK_W = 0x57;
        public const int VK_X = 0x58;
        public const int VK_Y = 0x59;
        public const int VK_Z = 0x5A;

        public const int VK_BACK = 0x08;
        public const int VK_TAB = 0x09;
        public const int VK_CLEAR = 0x0C;
        public const int VK_RETURN = 0x0D;
        public const int VK_SHIFT = 0x10;
        public const int VK_CONTROL = 0x11;
        public const int VK_MENU = 0x12;
        public const int VK_PAUSE = 0x13;
        public const int VK_CAPITAL = 0x14;
        public const int VK_KANA = 0x15;
        public const int VK_HANGEUL = 0x15;
        public const int VK_HANGUL = 0x15;
        public const int VK_JUNJA = 0x17;
        public const int VK_FINAL = 0x18;
        public const int VK_HANJA = 0x19;
        public const int VK_KANJI = 0x19;
        public const int VK_ESCAPE = 0x1B;
        public const int VK_CONVERT = 0x1C;
        public const int VK_NONCONVERT = 0x1D;
        public const int VK_ACCEPT = 0x1E;
        public const int VK_MODECHANGE = 0x1F;
        public const int VK_SPACE = 0x20;
        public const int VK_PRIOR = 0x21;
        public const int VK_NEXT = 0x22;
        public const int VK_END = 0x23;
        public const int VK_HOME = 0x24;
        public const int VK_LEFT = 0x25;
        public const int VK_UP = 0x26;
        public const int VK_RIGHT = 0x27;
        public const int VK_DOWN = 0x28;
        public const int VK_SELECT = 0x29;
        public const int VK_PRINT = 0x2A;
        public const int VK_EXECUTE = 0x2B;
        public const int VK_SNAPSHOT = 0x2C;
        public const int VK_INSERT = 0x2D;
        public const int VK_DELETE = 0x2E;
        public const int VK_HELP = 0x2F;
        public const int VK_LWIN = 0x5B;
        public const int VK_RWIN = 0x5C;
        public const int VK_APPS = 0x5D;
        public const int VK_SLEEP = 0x5F;
        public const int VK_NUMPAD0 = 0x60;
        public const int VK_NUMPAD1 = 0x61;
        public const int VK_NUMPAD2 = 0x62;
        public const int VK_NUMPAD3 = 0x63;
        public const int VK_NUMPAD4 = 0x64;
        public const int VK_NUMPAD5 = 0x65;
        public const int VK_NUMPAD6 = 0x66;
        public const int VK_NUMPAD7 = 0x67;
        public const int VK_NUMPAD8 = 0x68;
        public const int VK_NUMPAD9 = 0x69;
        public const int VK_MULTIPLY = 0x6A;
        public const int VK_ADD = 0x6B;
        public const int VK_SEPARATOR = 0x6C;
        public const int VK_SUBTRACT = 0x6D;
        public const int VK_DECIMAL = 0x6E;
        public const int VK_DIVIDE = 0x6F;
        public const int VK_F1 = 0x70;
        public const int VK_F2 = 0x71;
        public const int VK_F3 = 0x72;
        public const int VK_F4 = 0x73;
        public const int VK_F5 = 0x74;
        public const int VK_F6 = 0x75;
        public const int VK_F7 = 0x76;
        public const int VK_F8 = 0x77;
        public const int VK_F9 = 0x78;
        public const int VK_F10 = 0x79;
        public const int VK_F11 = 0x7A;
        public const int VK_F12 = 0x7B;
        public const int VK_F13 = 0x7C;
        public const int VK_F14 = 0x7D;
        public const int VK_F15 = 0x7E;
        public const int VK_F16 = 0x7F;
        public const int VK_F17 = 0x80;
        public const int VK_F18 = 0x81;
        public const int VK_F19 = 0x82;
        public const int VK_F20 = 0x83;
        public const int VK_F21 = 0x84;
        public const int VK_F22 = 0x85;
        public const int VK_F23 = 0x86;
        public const int VK_F24 = 0x87;
        public const int VK_NUMLOCK = 0x90;
        public const int VK_SCROLL = 0x91;

        #endregion Virtual Keys Constants

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern int SendMessage(int hWnd, int msg, int wParam, IntPtr lParam);
        [DllImport("user32.dll", CharSet = CharSet.Auto)] // used for button-down & button-up
        private static extern int PostMessage(int hWnd, int msg, int wParam, IntPtr lParam);
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern bool SetForegroundWindow(IntPtr hWnd);

        public void SetFocus()
        {
            SetForegroundWindow(new IntPtr(this.handle));
        }

        public void SendLeftButtonDown(int x, int y)
        {
            PostMessage(handle, WM_LBUTTONDOWN, 0, new IntPtr(y * 0x10000 + x));
        }

        public void SendLeftButtonUp(int x, int y)
        {
            PostMessage(handle, WM_LBUTTONUP, 0, new IntPtr(y * 0x10000 + x));
        }

        public void SendLeftButtondblclick(int x, int y)
        {
            PostMessage(handle, WM_LBUTTONDBLCLK, 0, new IntPtr(y * 0x10000 + x));
        }

        public void SendRightButtonDown(int x, int y)
        {
            PostMessage(handle, WM_RBUTTONDOWN, 0, new IntPtr(y * 0x10000 + x));
        }

        public void SendRightButtonUp(int x, int y)
        {
            PostMessage(handle, WM_RBUTTONUP, 0, new IntPtr(y * 0x10000 + x));
        }

        public void SendRightButtondblclick(int x, int y)
        {
            PostMessage(handle, WM_RBUTTONDBLCLK, 0, new IntPtr(y * 0x10000 + x));
        }

        public void SendMouseMove(int x, int y)
        {
            PostMessage(handle, WM_MOUSEMOVE, 0, new IntPtr(y * 0x10000 + x));
        }

        public void SendKeyDown(int key)
        {
            PostMessage(handle, 0, key, IntPtr.Zero);
        }

        public void SendKeyUp(int key)
        {
            PostMessage(handle, WM_KEYUP, key, new IntPtr(1));
        }

        public void SendChar(char c)
        {
            SendMessage(handle, WM_CHAR, c, IntPtr.Zero);
        }

        public void SendString(string s)
        {
            foreach (char c in s) SendChar(c);
        }
    }
}
